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Class 12 Physics
Electromagnetic Induction Chapter 6
Quiz 1
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A constant current I is maintained in a solenoid. Which of the following quantities will not increase if an iron rod is inserted in the solenoid along its axis?
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Magnetic field at the centre.
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Self-inductance of the solenoid.
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Magnetic flux linked with the solenoid.
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Rate of joule heating.
Whenever the magnetic flux () linked with a coil changes the emf is induced in the circuit, This emf lasts
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as long as the change in flux continues.
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for a long time
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for a short time
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forever
The expression for the magnetic flux
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A
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B
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C
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D
A magnet is moved towards the coil (a) quickly and (b) slowly, and then the work done is
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does not depend on the motion of the magnet.
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smaller in case (a)
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equal in both cases
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larger in case (a)
A cylindrical bar magnet is held along the axis of a circular conducting loop. Which one of the following movements of the bar magnet will not induce a current in the loop?
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The magnet is rotated about its own axis.
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The magnet is moved along its length.
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The magnet is rotated about an axis passing through its mid point and perpendicular to its length.
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The magnet is rotated about an axis through one end and perpendicular to its length.
The magnetic flux () linked with a coil is related to the number (N) of turns of the coil as
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A
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B
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C
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D
The total number of magnetic lines of force crossing a surface normally is termed as
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Magnetic field.
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Magnetic permeability.
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Magnetic flux.
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Magnetic susceptibility.
In the given circuit the maximum deflection in the galvanometer occurs when
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magnet is rotated inside the coil
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magnet is stationary at the center of the coil.
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numbers of turns in the coil is reduced.
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magnet is pushed into the coil.
A coil of area 10 cm² of 20 turns is placed in uniform magnetic field of 104 gauss. The normal to the plane of the coil makes an angle of 60° with the magnetic field. The flux in maxwell through the coil is
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105
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106
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103
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104
The magnetic flux () linked with a coil is maximum, when the angle between the plane of the coil and the direction of the field is
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π/4
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π/3
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π/2
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